I. RESEARCH BACKGROUNDThe mine-tailing ponds are one of the indispensable and important facilities for mine industry, and it is a major artificial danger source with high potential energy. Accidents happening beside mine-tailing slopes will cause mine loss and environmental pollution, etc. Seriously, it will pose a huge threat to the residents living in the downstream in terms of their life and property safety [1,2,3, 7]. Strikingly, it is paramount for mining enterprises in guaranteeing their normal operation and surrounding ecological environment to improve the safety and stability of mine-tailing slopes. Wei Fa-zheng successfully and effectively enhanced the safety and stability of mine-tailing reservoirs by laying high-strength geogrid in dam body, burying soft-typed water pipe and other measures together[1]; Wei Zuo-an and other researchers proposed to reinforce mine-tailing dams by adopting the terminal scroll-type geogrid, which turned out effective in dam's stability enhancement [2]. Zhao Yi-shu and others carried out a model test study on the damage to the doom of the reinforced mine-tailing dams, showing that the blockade effects accompanying the damage process of the reinforced belt could effectively intensify the steadiness of dams [3]. Because of the complex mechanism of soil reinforcement and numerous factors influencing reinforcement effect, it is greatly instructive for engineering-project practices to ensure the main influencing factors.There are two common analysis methods for test results calculated by orthogonal experimental method: range analysis and variance analysis. This paper will employ the variance analysis method suitable for sensitivity analysis and significance test to determine the dominant factors that influence the stability of reinforced mine-tailing slopes [4]. The design of the reinforcement project in mine-tailing slopes will focus on the main factors dominating the stability of reinforced mine-tailing slope, so the governance for the reinforced mine-tailing slopes will become more reasonable, reliable and economical.
II. ORTHOGONAL DESIGN
A. Introduction to Orthogonal DesignUsing Orthogonal experimental design (hereinafter called as orthogonal method for short) method, multi-factor and multi-level test programs can be in a reasonable and scientific arrangement and get reliable and convincing outcomes with a few numbers of tests. The orthogonal design first determines the factors influencing relevant indicators, then initially combines the orthogonal table to determine the level number and the level value of each factor. And later, determine the test plan based on orthogonal table, calculate and record the results and finally make reasonable analysis.
B. The Determination of the Orthogonal Factor Level TableAs for the mine-tailing slopes with geogrid reinforcement, from the perspective of engineering project, this paper mainly considers five factors: geogrid laying length (L), geogrid laying distance (D), geogrid laying angle (θ), geogrid tensile strength (T) and geogrid modu...
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